Multiple-transmission-ratio transmission arrangement with gear-shift overlap action of automatically varied duration
US4041809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Oct 10, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/1252
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The transmission arrangement includes first and second hydraulically activatable units. When the first and second units are activated and unactivated, respectively, the arrangement exhibits a first transmission ratio. When the first and second units are unactivated and activated, respectively, the arrangement exhibits a second transmission ratio. Electrically controllable first and second valves each connect an associated unit to a source of hydraulic fluid. A transmission-ratio changeover is effected by causing the valves to undergo opposite changes of energization state. Each valve has its own time-delay stage. Upon receipt of a signal commanding a transmission-ratio changeover, each time-delay stage delays the initiation of the change of energization state of the associated valve by a respective time-delay interval. During a changeover from the first to the second transmission ratio, the initiation of the change of energization state of the first valve can be made to either lead or lag that of the second valve, simply by making the first time-delay interval either shorter or longer than the second time-delay interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.